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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-05-26 20:50:28 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-27 12:26:01 +0200 |
| commit | a5b1cf288d4200506ab62fbb86cc81ace948a306 (patch) | |
| tree | c95339866f4d67220d111811a92e5c6b79de6ab4 /net/ipv6/af_inet6.c | |
| parent | gro: Optimise length comparison in skb_gro_header (diff) | |
| download | linux-a5b1cf288d4200506ab62fbb86cc81ace948a306.tar.xz linux-a5b1cf288d4200506ab62fbb86cc81ace948a306.zip | |
gro: Avoid unnecessary comparison after skb_gro_header
For the overwhelming majority of cases, skb_gro_header's return
value cannot be NULL. Yet we must check it because of its current
form. This patch splits it up into multiple functions in order
to avoid this.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/af_inet6.c')
| -rw-r--r-- | net/ipv6/af_inet6.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index 61f55386a236..b6215be0963f 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -817,13 +817,20 @@ static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, struct sk_buff *p; struct ipv6hdr *iph; unsigned int nlen; + unsigned int hlen; + unsigned int off; int flush = 1; int proto; __wsum csum; - iph = skb_gro_header(skb, sizeof(*iph)); - if (unlikely(!iph)) - goto out; + off = skb_gro_offset(skb); + hlen = off + sizeof(*iph); + iph = skb_gro_header_fast(skb, off); + if (skb_gro_header_hard(skb, hlen)) { + iph = skb_gro_header_slow(skb, hlen, off); + if (unlikely(!iph)) + goto out; + } skb_gro_pull(skb, sizeof(*iph)); skb_set_transport_header(skb, skb_gro_offset(skb)); |